Effects of Aluminizing on the High Temperature Oxidation Behavior of High Silicon Cast Iron

Meng Bin Lin; Chaur Jeng Wang

doi:10.4028/www.scientific.net/AMR.79-82.2151

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 79-82Effects of Aluminizing on the High Temperature...

Effects of Aluminizing on the High Temperature Oxidation Behavior of High Silicon Cast Iron

Abstract:

In this study, the aluminizing of high silicon cast iron by hot-dipping in pure Al melt was performed and their high temperature oxidation behaviour was tested at 750 °C for virous exposure time. After high temperature oxidation tests, the microstructure analysis of all samples were investigated by means of metallographical examination, scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectrometer (EDS) and X-ray diffractometry (XRD).The results showed that the coating layers consisted of three layer, in the sequence of Al, Fe-Al and Si-rich layers from external topcoat to substrate. Nodules graphite had a blocking effect to retard the outward diffusion of Fe atoms and impeded the growth of Fe2Al5 in C-axis. Eventually, the cast iron substrate was oxidized directly by oxygen penetration via the greater cracks and pores to form Fe oxide nodules after 750 °C oxidation for 48h.

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Periodical:

Advanced Materials Research (Volumes 79-82)

Pages:

2151-2154

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.79-82.2151

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Online since:

August 2009

Authors:

Meng Bin Lin, Chaur Jeng Wang

Keywords:

Aluminide Layer, Decarburization, High Silicon Cast Iron, Nodule

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